What?
Anyway the answer is yes & no. No as in, no you can't just copy and paste the files that worked for CEMU to the console. The external drive will need to be format by the console and after that, the drive will only works for that console alone. Then you can use Nusspli:
https://github.com/V10lator/NUSspli to directly download and install stuff on the console.
Or if Nusspli is too slow for you then you can use WIIUdownloader:
https://github.com/Xpl0itU/WiiUDownloader/releases to download the games to mac or pc then copy them to the sd card, then use Nusspli to install them.
Don't even bother look up loadiin or wupinstaller etc. Those are old and outdate.